#include<stdio.h>
int breed(int n)
{
	if (n < 2)
	{
		return 1;
	}
	int a = 1, b = 1, c;
	for (int i = 2; i <= n; i++)
	{
		c= a+b;
		a = b;
		b = c;
	}
	return c;
}
int main()
{
	int result = breed(12);
	printf("%d", result);
	return 0;
}